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The entries of a playlist file usually refer either to local files (in the same directory as the playlist), or absolute paths like URLs. In the first case, you want to add the base path of the playlist file to the files, so that mplayer can find the files. In the second case, the URLs should not be changed. Unfortunately, mp_path_join() recognizes URLs as relative paths, and changes them. E.g. it tried to play /path/to/playlist/http://entry. Add some code to deal with this properly. The added code uses the same approach as m_option_type_custom_url in m_option.c, but because it's so short and trivial, it's perhaps better not to rely on the option parser code. It's also unclear whether mp_path_join() should contain this logic, but maybe it's better to keep the logic of that function clean.
Compiling with full features requires development files for several external libraries. Below is a list of some important requirements. For more information see the output of './configure --help' for a list of options, or look at the list of enabled and disabled features printed after running './configure'. If you think you have support for some feature installed but configure fails to detect it, the file config.log may contain information about the reasons for the failure. Libraries specific to particular video output methods (you'll want at least one of VDPAU, GL or Xv): - libvdpau (for VDPAU output, best choice for NVIDIA cards) - libGL (OpenGL output) - libXv (XVideo output) general: - libasound (ALSA audio output) - various general X development libraries - libfreetype (for libass) - libfontconfig (for libass) - libass - FFmpeg libraries (libavutil libavcodec libavformat libswscale libpostproc) Most of the above libraries are available in suitable versions on normal Linux distributions. However FFmpeg is an exception (distro versions may be too old to work at all or work well). For that reason you may want to use the separately available build wrapper that first compiles FFmpeg libraries and libass, and then compiles the player statically linked against those.